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Aircraft > Flight Instruments > Flashcards

Flight Instruments Flashcards

1
Q

What is the Altimeter?

A

A device which senses the normal decrease in air pressure that accompanies an increase in altitude.

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2
Q

Altimeters are calibrated to ISA, True or False?

A

True

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3
Q

If local pressure and temperature gradients do not follow ISA assumptions, errors can occur. True or False?

A

True

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4
Q

What is the VSI?

A

The vertical speed indicator?

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5
Q

What does the VSI show?

A

The rate of climb/decent in feet per minute.

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6
Q

How many feet is the VSI dial calibrated in?

A

100ft/minute (up or down)

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7
Q

Due to lag in the instrument, several seconds of steady climb/descent or level flight must elapse before an accurate reading is displayed. True or False?

A

True.

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8
Q

What is an ASI?

A

An air speed indicator

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9
Q

What is the white arc for?

A

Flap operating speeds

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10
Q

What is the green arc?

A

Indicates normal operating speeds.

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11
Q

What is the yellow arc?

A

Caution

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12
Q

What is the red sash on the ASI?

A

Never exceed

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13
Q

How does the ASI measure your speed?

A

Measures the difference between static pressure (usually from a sensor not in the airstream) and dynamic pressure received from the pitot tube

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14
Q

When the aircraft isn’t moving the pressures are equal to?

A

Zero and is the airspeed

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15
Q

Pitot =

A

Static + dynamic pressure

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16
Q

By subtracting static pressure, the ASI can indicate the speed at which the aircraft moves through the air.

A

True

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17
Q

What errors does the ASI suffer from?

A

Instrument
Position
Density
Compression

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18
Q

What is compression error?

A

speeds of 300+kts suffers effects of compression

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19
Q

What is Density error?

A

Air Density decreases with altitude. As aircraft climbs there is less air pressure in the pitot tube. Therefore, reading of airspeed decrease with height(although aircraft may be traveling at the same speed through the air)

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20
Q

When are IAS and TAS roughly the same?

A

Near sea level

21
Q

What are Position errors?

A

When the pitot isn’t getting air in. Pitot should always point directly into relative airstream.

22
Q

What are instrument errors?

A

Instruments have small imperfections caused by friction/mechanical. Corrections can be applied by reading off a correction table.

23
Q

What is a Mach Meter?

A

A device used to show a Mach number

24
Q

The speed of sound is directly related to the temperature of the air through which it travels.
True or False?

A

True

25
Q

What errors instruments are used in combination for the Mach meter?

A

ASI and Altimeter

26
Q

What errors does the Mach meter suffer from?

A

Same as the ASI and Altimeter

27
Q

What is inertia?

A

The tendency of the gyro to keep a fixed position in relative space

28
Q

What is precession?

A

When a subjected to a force, the gyro acts as though the force has been applied at 90 degrees to the rotor, at a position 90 degrees forward in the direction of rotation of the rotor

29
Q

What does the turn and slip indicator utilise?

A

The gyros property of precession ( when it is tilted it turns) it can be set up to react to a turn

30
Q

Define a Rate one turn

A

Described as 3 degrees/second

360 degrees in 2 minutes

31
Q

If the balance ball rolls in the opposite direction to the turn it indicates a?

A

Skid

32
Q

If the balance ball rolls in the same direction as the turn indicator it indicates a?

A

Slip

33
Q

The artificial horizon employs the gyro property of inertia. True or False?

A

True

34
Q

The artificial horizon’s gyro is tied by gravity to keep the same position relative to the centre of the earth.

True or False?

A

True

35
Q

What is a flight director?

A

An artificial horizon with command bars

36
Q

Will pilots use the AH/FD with other equipment and which ones?

A

Yes
VSI
Altimeter

37
Q

What errors does the flight director suffer from?

A

When accelerating indicates a small nose up indication

A similar effect is observed in a tight turn

38
Q

Does the magnetic compass require external power?

A

No

39
Q

Does a magnetic compass suffer from deviation error?

A

Yes

40
Q

What causes deviation error?

A

Suffers from a/c electrical equipment, metal structure, rotating propeller.
Iron metallic components.

41
Q

What is deviation?

A

The error induced in a compass by local magnetic fields; creating compass north.

42
Q

Compasses are checked at what degree increments?

A

30 degrees

43
Q

How is deviation minimised?

A

Compass correction card

44
Q

What is dip error?

A

Compass aligns itself with earth’s magnetic field. At or near the equator. Aircraft nears either magnetic pole s and the lines of force dip into the ground. Compass needle points down instead of staying near the horizon

45
Q

What is acceleration error?

A

Occurs during airspeed changes and is most apparent on headings of east and West.

46
Q

What does ANDS stand for?

A

Acceleration north, deceleration south

47
Q

What is the Gyrosyn Compass?

A

A combination of a gyro and magnetic compass

48
Q

The gyroscope is continuously aligned with magnetic north by a magnetic flux detector. True or False?

A

True

49
Q

What causes Position errors?

A

When flying at low airspeed/ high AoA

Aircraft (13 decks)

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